Stereospecific polymerization of propylene with group 4 ansa-fluorenylamidodimethyl complexes
Journal of Organometallic Chemistry 691 巻 1-2 号
193-201 頁
2006-01 発行
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JOrganometChem691_193.pdf
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種類 :
全文
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タイトル ( eng ) |
Stereospecific polymerization of propylene with group 4 ansa-fluorenylamidodimethyl complexes
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作成者 |
Nishii Kei
Hagihara Hideaki
Ikeda Tomiki
Akita Munetaka
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収録物名 |
Journal of Organometallic Chemistry
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巻 | 691 |
号 | 1-2 |
開始ページ | 193 |
終了ページ | 201 |
著者キーワード |
Atactic
Metallocene catalysts
Polypropylene
Syndiotactic
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内容記述 |
Group 4 [η1:η3-tert- butyl(dimethylfluorenylsilyl)amido]dimethyl complexes [t-BuNSiMe 2Flu]MMe2 (M = Ti, 1; Zr, 2; Hf, 3) were synthesized in a one-pot synthesis starting from the ligand, MeLi and MCl4 (M = Ti, Zr, Hf), respectively. The structures of these complexes were determined by X-ray crystallography and the results obtained revealed that the fluorenyl ligand coordinates to center metal in a η3-manner irrespective of center metal employed. Propylene polymerization was conducted at 0 or 20 °C in toluene by 1-3 combined with dried methylaluminoxane (MAO), which was prepared from the toluene solutions of MAO by removing free trialkylaluminiums, and HNMe2PhB(C6F5)4 in the presence of triisobutylaluminium. The 1-dried MAO system gave the polymer with syndiotactic triad (rr) of 63 0x1.e2fc8p-891t 0 °C, whereas 2 and 3 did not give any polymer in the same conditions. The 2-dried MAO system gave the polymer with the highest syndiotacticity (rr = 97%) at 20 °C, although the activity was low. The 3-dried MAO system did not give any polymer even at 20 °C. When HNMe2PhB(C6F5)4 was used in place of dried MAO at 20 °C, 1 gave almost atactic polymer, while 2 and 3 gave highly syndiotactic one (rr > 90%). These results indicate that the catalytic performance strongly depended on the center metal of the ansa- fluorenylamidodimethyl complexes as well as cocatalysts employed.
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NDC分類 |
化学 [ 430 ]
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言語 |
英語
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資源タイプ | 学術雑誌論文 |
出版者 |
Elsevier
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発行日 | 2006-01 |
権利情報 |
Copyright (c) 2005 Elsevier B.V
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出版タイプ | Author’s Original(十分な品質であるとして、著者から正式な査読に提出される版) |
アクセス権 | オープンアクセス |
収録物識別子 |
[ISSN] 0022-328X
[DOI] 10.1016/j.jorganchem.2005.08.027
[DOI] http://dx.doi.org/10.1016/j.jorganchem.2005.08.027
~の異版である
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